Пожалуйста помогите, переработайте предложения в пассив воис даю 20 балов

1. These exercises must be done by you tomorrow.

2. The book you neen can be found by you in any library.

3. These letters must be sent by us at once.

4. The box must be taken by you to the station.

5. The river can be crossed by you on a raft.

6. The building of the house can be finished by the workers very soon.  

7. The books must be returned by you the day after tomorrow.

8. This mistake can be easily forgiven by me.  

9. Such berries can be found by you everywhere.  

10. This work must be done by you very carefully.  

11. The doctor says that she  must be taken by them to hospital.  

12. The work can be done by you in three days.  

13. All the library books must be returned by the students before each summer vacation.

14. Even the tallest tress can be climbed by monkeys.